1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
2 // RUN: %clang_cc1 -fsyntax-only -std=c++1y %s -verify -DCPP1Y
3 
4 void missing_lambda_declarator() {
5   [](){}();
6 }
7 
8 template<typename T> T get();
9 
10 void infer_void_return_type(int i) {
11   if (i > 17)
12     return []() { }();
13 
14   if (i > 11)
15     return []() { return; }();
16 
17   return [](int x) {
18     switch (x) {
19     case 0: return get<void>();
20     case 1: return;
21     case 2: return { 1, 2.0 }; //expected-error{{cannot deduce}}
22     }
23   }(7);
24 }
25 
26 struct X { };
27 
28 X infer_X_return_type(X x) {
29   return [&x](int y) {
30     if (y > 0)
31       return X();
32     else
33       return x;
34   }(5);
35 }
36 
37 X infer_X_return_type_fail(X x) {
38   return [x](int y) {
39     if (y > 0)
40       return X();
41     else
42       return x;
43 #if __cplusplus <= 201103L
44     // expected-error@-2 {{return type 'const X' must match previous return type 'X' when lambda expression has unspecified explicit return type}}
45 #endif
46   }(5);
47 }
48 
49 struct Incomplete; // expected-note{{forward declaration of 'Incomplete'}}
50 void test_result_type(int N) {
51   auto l1 = [] () -> Incomplete { }; // expected-error{{incomplete result type 'Incomplete' in lambda expression}}
52 
53   typedef int vla[N];
54   auto l2 = [] () -> vla { }; // expected-error{{function cannot return array type 'vla' (aka 'int [N]')}}
55 }
56